Catalyzes the oxidation of glutathione amide (GASH) to produce glutathione amide disulfide (GASSAG). May play a role in GASH metabolism under anaerobic conditions as a sulfide carrier necessary for cytoplasmic sulfide oxidation.

Also known as Glutathione amide-dependent peroxidase (Prx/Grx).Catalyzes the oxidation of glutathione amide (GASH) to produce glutathione amide disulfide (GASSAG). May play a role in GASH metabolism under anaerobic conditions as a sulfide carrier necessary for cytoplasmic sulfide oxidation.